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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b304ce6e1b822f92871a4a53653841a0343ea4aa97dc6edb6691e26163603c28' 
  AND token = 'kl/Z1BnvvhiRaqk54Sslw+68isOoSoL3/y1tSLkytBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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