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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e439d910d0fdf061a41c70b488be9f9c212c1d477a252aaba8b77f813f0ba31c' 
  AND token = 'XrreEius4PBHyzyyQxcs9SP8IzCaT3LfaIIzOUl/imQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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