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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19e512437944887a85da506f96a71a28b32daced9eafcc3941b4ce72f9aa4b5' 
  AND token = '0oN+Up0jhdALdyYRmvUu71vr8nAFUXw3sCzyaBlNatc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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