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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b62fd11979e8b4448ac93611d56e795f7f3c327a66022d6816aad7563f7ce7d' 
  AND token = 'JTOpdYPOH0iAm0jtRI9OS7/XDqfALMafBEqebUzmY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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