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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0f57c7dab771b0262f12d9f16555bccb1646910ac2aacab84b260499adb4b3' 
  AND token = 'pgiLmP3DJ64tlR5shSRcBh2dglPA71Zt/ohSFO32n+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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