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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1c5a62c9929e60131cd91fcdf2e32450ceaa08b926547ef0a638c774512de5' 
  AND token = 'oM0IWfi53v1/PJ7uCFUgq5wDjIFqcKNRKS19JwmPnvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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