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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e608f08d1b0f50892b4c8191df9a666d3f00bf901aee85639e7dd300bb61b45f' 
  AND token = 'V0/NHDq18G8RWLZrDP4jya9FqSfEGYzBR4IrQoHA5Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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