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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c42ad0043abfc2db6c77cc126cfa5979425edc0b9198ca267ab2e9203da688' 
  AND token = 'mZL1apboQ7ZDGgKbgCGwmXTZdVrxO/vvh96b01yY6Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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