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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766646f684f2f20c241b58ae6c88e92d8e069f4151d63660aed262cb4d658c8b' 
  AND token = 'lvLPwk1YAGd4NBVbvFdcCPB77v1U+zIASXkhd4X/4T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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