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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5edcabd6e62e92b9be84706667677949d8448f85cb07a48673e9d423a052eba' 
  AND token = 'Ba9GIR8Ux48oJz84qAOUcGKMtb6El0NP2zlDeSDT0/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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