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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f60b3ab39bd4a9aba3e59ea807ebd439f8f1dc2a0d5df18ea4f9765e10db7d' 
  AND token = 'MII1AUxDrtMfbGFnacGlXF3dFlpAxp5O6v+iG51eI24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}