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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0c5b822bfd09f5fd619bf3b9091be717903ed89f5aa0051b480a5db5e78262' 
  AND token = 'o0kXEozm6tWCS6oePn+/mraHcEbU9k7fbc1Vu3/Sx04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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