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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f03c6def52208e2f35dc766855c52f03ebfc56afac1b0c21ef9eff686cad539' 
  AND token = 'idFeaZoyf6BXZ/R+RbX8AnzdX/xG3y+Vh/G9tlvbpKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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