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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a2264b4d749f2e7bf80cbcaad076e0c15d4d9b865eae8d3b9a3ac6ad3f1763' 
  AND token = 'zp8vurm4UR6qBC6MTHec40q3qy8mLNwrH2I3sCatwW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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