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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4027e1a3d7010a48da9965e32e8211523140defbf14926105e65936cf52ced1' 
  AND token = 'dM92s3LBOGqmUPO7VIpK1nUXWu2LHYNPpbKS6ds6Nj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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